MicroNet Technology SP3367A - Manual (Page 17)

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ISDN Splitter Configuration (ADSL over ISDN)
A ISDN splitter separates ADSL signals from ISDN signals on your ISDN
telephone line. The ISDN splitter works by running a separate ADSL line
from the ISDN line, so that the ADSL router has a cable dedicated for data
transmission. Figure 2-5.3 shows how to connect all cables to the Router.
Figure 2-5.3 Router Connected through a ISDN Splitter
Note: The ISDN splitter may also be installed on the outside of the house
adjacent to the telephone network interface device (NID).